Will lithium batteries and lead-acid batteries explode if they are overcharged?

1. Lithium battery will explode Lithium battery will explode because of a process called thermal runaway in the reaction inside the battery. Thermal runaway is a positive energy feedback cycle: increased temperature will cause the system to heat up, and the system will heat up and increase the temperature, which in turn makes the system hotter. Thermal runaway is a very common phenomenon. Thermal runaway may occur in a large number of physical and chemical processes from concrete curing to star explosion. 2. Lead-acid batteries will also explode. New lead-acid batteries have more chemical reaction materials, higher terminal voltage and lower internal resistance, while old lead-acid batteries have lower terminal voltage and higher internal resistance. The charging voltage at both ends of the lead-acid battery will be higher than the charging voltage at both ends of the new battery. As a result, the new lead-acid battery is not fully charged, and the old lead-acid battery is already too high; and in the discharged state, the capacity of the new lead-acid battery is higher than that of the old one. The battery capacity of the battery is large, resulting in excessive discharge of the old battery, and even the reverse polarity of the old lead-acid battery, and the swelling of the lead-acid battery causes secondary use. It will consume the power of the new lead-acid battery, and at the same time cause the voltage in the electrical appliance to be unstable. There is also the danger of overuse of the old lead-acid battery. Many so-called battery explosion cases are not actually battery explosions, but the controller or electrical system has a short circuit or a fault that causes the capacitor to explode. The scale of this explosion is very small, and many just have some sound and sparks. In this case, the fire is the biggest Source of risk. In the worst case, the battery really exploded. In one case, the inferior battery does not have a safety valve or the safety valve is damaged, and cannot be used for pressure relief. When the internal pressure of the battery is too high, it will explode; in the other case, the battery charger fails and the battery is overcharged. Hydrogen is precipitated inside, and deflagration occurs when the hydrogen and oxygen are mixed in a certain ratio. Reasons for lithium battery explosion 1. Piercing: Compared with short circuit and overcharging, piercing a lithium battery is also a very unwise approach. If the lithium battery is pierced by any hard object, the lithium ions inside it will directly chemically react with the oxygen in the air, and the phenomenon of violent combustion will also occur. 2. Beware of high temperature and fire: high temperature or fire will also cause the explosion and burning of lithium batteries. Especially in the hot summer or in a car exposed to the sun for a long time, the ambient temperature of the lithium battery will be higher than its normal storage temperature. 3. Long-term overcharge of the battery: In the long-term charging state, overcharge and overcurrent will also cause high temperature and high pressure, which may cause hidden dangers. Lithium batteries may instantaneously discharge under special temperature, humidity, and poor contact conditions, resulting in a large amount of current, spontaneous combustion or explosion. 4. Charging causes the battery to explode: playing with the phone while charging, and charging while playing will cause the charging time to become longer. Charging for a long time will cause the temperature of the phone to rise, making it easier to explode. Reasons for the explosion of lead-acid batteries 1. Poor battery quality: poor quality of separators or defects, allowing active material on the plates to pass through, causing virtual or direct contact between the positive and negative plates; 2. Overcharging: Lead-acid batteries are overcharging At the time, the water in the battery electrolyte will be electrolyzed, and hydrogen and oxygen will appear after being electrolyzed. These are flammable and explosive gases. When the hydrogen content in the battery or in the air accumulates to the explosive limit, an open flame will be encountered outside. , It is very likely to burn or explode. 3. Blocked vent holes: Due to the blockage of the vent holes of traditional lead-acid batteries, the battery will burst first, which will cause the battery to vibrate, and sparks will appear when the pole wiring is not strong, which will cause an explosion. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What is the method of assembling the lithium battery pack?